Author(s):

Pinkesh Ahlawat, Rajendra Singh, Vijay Kumar Gupta, MP Gautam and Nirvesh Singh

Abstract: The field experiment was conducted in randomized block design with three replications of eight treatments for a crop season of the year i.e. “<em>Rabi</em> 2015-16” at entomological research block of crop research centre, Sardar Vallabhbhai Patel University of Agriculture and Technology, Meerut - 250110 (U.P.), India. In extensive during study, the population of <em>Liphaphis erysimi</em> (Kalt), on mustard crop. The data showed that population of <em>L. erysimi</em> appeared in last week of December i.e. 51^st standard week and continued till last week of March i.e. 13^th standard week. The pest populations recorded as number of aphids per 10 cm main apical shoot. The aphid population was low during the 51th standard week of the December to 3^st week of January which varied between 2.50 to 7.50 aphids. The pest population increased from third week of January and reached its peak during 7^th standard week i.e. third week of February. During this period the weather parameters like mean temperature and relative humidity ranged from 12.10 ⁰C to 16.20 ⁰C and 80.2 to 71.70 per cent, respectively. The pest population declined thereafter and varied from 18.50 to 65.25 aphids/10cm main apical shoot. During this period mean temperature and relative humidity ranged from 12.10 ⁰C to 16.20 ⁰C and 81.20 to 71.70 per cent, respectively. The population of aphids suddenly decreased in the last week of March (12^th standard week) and last week of March (13^th standard week).

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